Brush for dynamo-electric machines and the like.



E. 0. SCHWEITZER. BRUSH FORIDYNAMO ELECTRIC MACHINES AND THE LIKE.

APPLICATION FILED MAB. 5, 1909.

Patented Nov. 8

, Chicago,

idly fixed to the brush-supportih UNITED STATES PATENT OFFICE.

EDMUND O. SCHWIEITZER; OF CHICAGO, ILLINOIS.

BRUSH FOR DYNAMO-ELECTRIC MACHINES AND an]: LIKE. I

Specification of Letters Patent.

Patented Nov,.8, 1910 To all whom it may concern:

Be it known that I, EDMUND O. SCHWEIT- znn, citizen of the United States, residing at in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Brushes for Dynamo-Electric Machines and the Like, of which the following is a full, clear, concise, ahd exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to brushes for dynamo electric machine coinini'itators and collector rings and the like.

Prominent objects of my invention are:' to provide a simple, practical and efi'ective' form of brush of the class specified; to prevent undesirable cuttingof the commutator or collector ring by the brush; to afford lubrication for the brush and moving member; to increase the resistance of the brush to a desirable e, teiit; and to accomplish the foregoing and other desirable results in a simple and expeditious manner. I In carrying out my invention in the wa herein set forth, I provide a brush of the class specified, and associate with the same means for supplying the brush surface with viscous, lubricating compound, which may be made of powdered graphite and oil, or any other suitable mixture. In this way,

the surface of the brush "is lubricated, and.

undesirable cutting is avoided, and other desirable results obtained, more particularly specified.

In. the accompanying drawings-Figure l is 'a View, largely in section, ofsa portion of a dynamo commutator, and a brush therefor embodying my invention; Fi 2 is a cross section of the brush roper; B 1g. 3 is a view of the surface of the brush; Fig. 4 is a transverse section on the line 44 iirFig. 1; Fig. 5 is a viewof a modified'form of device.

In the drawings igs. l to 4) II. have shown a commutator 1 of -some dynamo electric mach-ine having a brush-supper 7 rod-or arm 2, which is understood of the dynamo in the usual way. pen this am 2 is mounted a frame" 3, which is fixed upon the arm 2 with considerable tightness.-

- Attlie end of the frame 3, abrush-holder 4!- is i'votally connected by a pivobbol t 5, Thi sbrliq h holder j v tighten a gap or crack 19 in the frame 3, to

sirable degree,-

coil spring 20, acting upon the piston 10". y

to be rigmember tune a brush 6, showii' 1 presided atits upper end with a band or collar 7, fitting in the brush-holder 4. At the top of the brush, and within the band 7, is a cylinder member 8, having a removable head 9, and containing a iston 10 controlled by a winged SCIBWll, Vlthlll the cylinder 8 is a viscous, lubricatin compound l2, of any suitable kindpreferably,-a mixture of graphite and oil. The brush 6 is provided w th a duct or passage 13, leading down from the chamber the latter is desirably provided with one or more grooves or channels 14, 14 (Fig; 3). v The frame 3 is provided with a spriiigattachinent 15,. in theform-of'astrip sur rounding said frame, and li'eld in place nuts'lG-and 17," and carrying a sprin 18, which acts upon the head 9' ofthe cylinder 8, so as to hold the-bolt normally upon-the commutator. The screw 17 also serves to tighten said frame and arm 2. v

It will be seen that the viscous lubricating compound will work through the passage 13 to t e surface of the brush, and will serve to lubricate the brush and commutator and prevent cutting and wearing of both, and also prevent noise, dust, and other uiidesirable results. Pressure can be exerted upon the lubricating compound by turning the the brush upon the screw 11 to force the piston down as desired. The use of oil in connection 'with graphite ncreases the resistance of the brush' to a desirable degree, but not to an unde- "In Fi '5 I lltLVShOWIl an arrangementin which the or spindle 11, which is surrounded by a The. spring continual applies pressure'i ipon the stem, and this pressure 13 waried by turning the threaded spindle 11 So as to .cmhpress the spring more. L"

In Fig. 6 I show'an arrangement in which the'- brush has a channel 135 with a cup shaped a the t p, so that. the. viscous material can sihlplyib p ed into it, and then allowed to run or trickle down onto the commutator, 'or be pushed dowii,'if needbe, by a pencil or small nod, or'some thing of the sort.

{it will be understood that changes niodificatioiis can be made withoutlil em v ing from'the spirit of the invention 65 or cylinder 8 to the surface ofthe brush, and i piston slides loosely onthe stein 1. A device of the class specified comprisa brush, a cylinder applied to the upper of said brush, the brush having a passa extending from the chamber of said cy inder to the surface of the brush, a piston in said cylinder and a threaded member for use-1n connection ,with said piston. a 2. A device'of the class specified COIIIPIlS- I assa 'e extendin ing a carbon brush-having its upper end '-provided with a metal band and having a and grooves in t e-bearing surface communicat n flixfithsaid passage; a cylinder attached iitheppperend. of the brush'within said n1etaf;""=liand, having its chamber communicating with the other end of said pasa piston within said cylinder, :1. removhead for said piston, and a Winged iii? screw threaded through said head and extended to said piston.

' 3. 1A device of the class 5 'ified comprising a brush havin a chain r for lubricating compound, an a passa e leading therefrom to the wearing sur ace,- and spring from one'end to the, other means for forcing said compound from the chamber.

4.! A device ofthe-class specified comprising a brush having a cylinder for lubrlcat ing compound and a passage leading therefrom to the wearing surface of the brush, a

piston in said cylinder and a spring acting upon said piston. 1 5. A device of the class specified comprising a brush having a cylinder for lubricatingcompound and a passage leadin r therefrom to the wearing surface of the rush, :1- piston in said cylinder, a spring actin 1 upon said iston and a stem or-spindle having three ed connections with the cylinder head and connected with said 5 ring so that by turging the spindle the sp'rlng will be tightene In witness whereof, vI hereunto subscribe my name ti '3 19th day of February A. D}, 1909.

1 EDMUND O. SCHYVEITZER. Witnesses:

' 'A. MILLER Bnnrmw, 

